Samuel s



istitu fts yLetters Patent No. 76,7` 69, dated April 14, 1868.

i IMPROVEMENT-IN STEAMENGINE VALVE-GEAR..

' itin Stigetnle niet@ tu intlgee itttttts rtteut mit. ranting partititttnna.

TO' ALL WHOM IT MAY CONCERN:

5e it known that LSAM'UEL S. .TAM-Iscar, Jr.,^'ot` Saltsburg, in thecounty of Indiana, and State of Penusylvania, have invented a newand-'improved Valve-Gear for Steam-Engine; and I do hereby declare'that'the* following is a'vfull, clear, und exactdeserption of thevconstruction and operation of the same, reference being had to theannexed drawings, making a part ot' this specification, in which- Figurelis u side elevation.

Figure 2 is a top view.

Figure?) is a. longitudinal vertical section.

Figure 4 is a c'rossjsect-i'on through the line a: x of' iig. 2.

Figure 5 is a. cross-scction through the line y g/ of `ig..2.

In this invention, ,the valve-gear is worked directlyby'the cross-head,the enginebeing'thereby greatly simplified, and the power that operatesthe valves being more economically applied than n any other engine.

In the drawings, A represents the cylinder, B the steam-chest, C thepiston-rod, D the pitman, E the crank-,l` thenmiu shaft, G thefly-wheel, and II the bed upon which the engine-is supportedi- All'theseparts nre in nowiseidierent from similar parts of other steam-engines,Aand I lay n`o claim toi invention upon them.

vMy invention consists iu ope-rating the main valve-stem I,by thecross-head C", by means of the device which I will now describe,

0n. the outside of the slidediurs K K, I attach two plates or bars ot'metal,- M M, which slide back and forth longitudinally with theslide-bars. Each sliile,lM, isnttaehed to the slide-bar on which itworks by means of a block, m, which slides back and t'ortlringuide-groovesnear the outer end of the slide-bars,'there being one blockto each slide-har, and the pituaan' working between them. At their innerend, the slides M M v.are connected by u strong metnllitc block, N,which extends'across the space hetween'the slide-bars, its ends fittingin .guide-grooves on their inner sides, and its central portion soenlarged that the piston-rod 'can workthrough an aperture init, assecn`in g. 5. I l

The outer ends of the slides M M' :1re bolted to the sliding blocks m mby 1erew-lmlts da, which pass through longitudinal slots e c in theslide-bars, as seen in figs.` 1, 2, 3,Y and-4.

The inner ends ofthe slides-ure attached to the block N by screw-boltsa" a', which also work in longitudinal slots t' z' in the slide-barsi' IThe cross-head C moves hack and forth between Vthe blocks N and m m,strikingthe former, and pushing it in towards thecylinder, on its inwardstroke, and striking against projecting 'shoulders on the latter, andpushing them outward, on `its outward stroke.`

The blocks mm N, and the slides M M, being all connected together, osabove described,willall move in out together,.by the operation of thecross-head, in the manner described.

I then connect the slides M M with the valve-'stem I by means of -n.lever', J, working on a. fulerum, j, near `itseentr'e, by whicharrangement, atevery stroke of the piston, the cross-head C, willreverse the valves.

'lhe lever .I may he provided with a handle, L, by which thee'ngine canbe reversed by hand.

This device is, perhaps, the simplest that can beconstrueted for thepurpose ot' operating the valve-gear of steam-engines. It dispenses withthe valvc-eceentries, eccentric-rods, Ste., and greatly reduces the costof the engine. It also works the vnlve-genr by the direct power of thewhole engine applied to the greatest advantage.

The blocks mm and N cnn be adjusted or. the A slides so as to out cti`the steam at any part of the stroke that may be thought desirable.

In order to prevent jarring, and give the engine nn easy, noiseless'action, I adjust rubber-spring eushions, s s, on the side of vthe blocksm and N towards the cross-head, which receive the stroke of thecross-head,

Having thusdescribed my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination ot' the slides M M, blocks mim N,-le ver J,valve-stem I, and cross-head C', when the said parts are constructed andarranged so as to operate the valve-gear from the cross-head,substantially as described.

2. The arrangement of the springs s s with th'efblocksm, and N,substantially as specified.

4 S. S. JAMISON, JR.

Witnesses:

CHARLES A. Pn'r'rrr, S. C. Komen.

